Island



(No Model.)

' O. D. ROGERS,

DIE FOR MAKING SCREW BOLTS.

No. 440,331. Patented Nov. 11, 1890.

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.of Rhode Island, have invented certain new UNITED STATES ATENT FICE= CHARLES D. ROGERS, OF PROVIDENCE, RHODE ISLAND, ASSIGNOR TO THE AMERICAN SCREW COMPANY, OF SAME PLACE.

SCREW-BOLTS.

SPECIFICATION forming part of Letters Patent No. 440,331, dated November 11, 1890.

Application filed August 4, 1890- Serial No. 360,866. (No model.)

To aZZ whom it may concern.-

Be it known that 1, CHARLES D. Roenss, a citizen of the United States, residing at Providence, in the county of Providence and State and useful Improvements in Tire-Bolts and Dies for Making the Same; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanyingdrawings, and to letters of reference marked thereon, which form a part of this specification.

In the production of tire-bolts as heretofore practiced it has been usual, so far as I am aware, to make the portion of the shank contiguous to the head substantially plain or smooth. An objection to such former bolts is that the smooth portion possesses but little holding capacity laterally when inserted into the wooden rim or felly of a wheel. Another objection is that the continual running of the wheel over uneven surfaces, coupled with a slight shrinkage of the wood, produces a jarring movement, which acts to loosen the bolt and at the same time causes a rattling noise. I would state that the hole bored through the wood for the bolt becomes gradually enlarged by wearing away or upsetting the fibers of the wood contiguous to the bolt, the same being due largely to the jar or vibrations of the wheel in running, as stated, and to the rotation of the bolt within the hole; but with the body of the bolt fluted, as herein described, there is sufficient engagement with the. wood to prevent or greatly diminish the tendency to turn.

The object I have in view is to produce a stronger tire-bolt than commonly made, and one, too, which is devoid of the objections before referred to.

To that end my present invention consists of a tire-bolt having the surface of its shank portion intermediate of the head and threaded portionsprovided with a series of longitudinally-arranged ribs and grooves or flutings.

My invention further consists of a novel form of die arranged to simultaneously form on the bolt-blank the screw-thread and the said fiutings.

My invention is more especially adapted to the rolling processthat is to say, the blanks are introduced singly between a pair of suitably-arranged reciprocating dies provided with ribs and grooves, which at one and the same operation impress or form the screwthreads and flutings into the blanks surface.

It would, I think, be impossible with any machinery now known to form on the surface of 6 0 a bolt at any reasonable expense the screwthread and fiuting which I have described;

, but by means of a die about to be described it can be done at an insignificant cost.

In the accompanying sheet of drawings, which illustrate my improvements, Figure 1 is a side elevation of the bolt or screw-blank. Fig. 2 is the same afterithas been acted upon by the dies which form the screw-thread and flutings. Fig. 3 shows thebolt provided with a nut. Fig. 4: is a cross-sectional view taken on line so as of Fig. 3, showing the arrangement of the peripheral ribs and grooves formed in the bolts surface. Fig. 5 is a similar View showing another form of flutings. Fig. 6 is a side elevation of the die adapted to produce the said screw-thread and grooves. As drawn, the figure represents the front or working v face. Fig. 7 is an end view, and Fig. 8 shows a partial plan view, of the die.

In the several figures, 0t indicates the bolt onscrew itself, the same having at one end a head It and at the other endascrew-threaded portion 25. The shank portion 5, intermediate of the head, and screw-threaded portions, is provided with a series of longitudinally-arranged ribs r and grooves. These I prefer to make well rounded both at the top and bottom transversely, substantially as shown in Fig. 4, although other forms maybe made, as shown in Fig. 5.

The die used is indicated by B. The up per portion of its working-face is provided with a series of parallel ribs m and grooves m, alternating with the ribs. The lower por- 5 tion of the dies face is provided with a series of inclined parallel ribs b and grooves 0, having a V-shape form. As drawn, the ribs and grooves are substantially uniform crosssectionally at any point throughout the length ICO of the die.

In rolling the bolts a the headed blanks a,

Fig. 1, are introduced singly between a pair size of the shank a.

of the dies 13, which are reversely arranged and separated laterally a distance somewhat less than the diameter or size of the wire or plain portion of the blank. Now upon reciprocating the dies toward each other the blank is seized between them, the continued-move ment of the dies impress the fluting-ribs m and threading-ribs 17 into the blanks surface simultaneously (the blank meanwhile turning on its axis) until at the end of the operation the dies pass each other and allow the nowfiuted andscrew-threaded screw or bolt a to drop from them. 111 thus rolling the screw the metal is expanded radially, so that the diameter taken across the fluted or screwthreaded portions exceeds that of the normal Obviously the form and number of the fiutings may be varied, as desired. So, also, in like manner the form of the screw-threads may be modified. As drawn, the threads t indicate a fine pitch or machine-thread. The threads may, however, be coarser, substantially like Wood-screws, without departing from the spirit of theinvention. Any such change or variation must first be effected by a corresponding change in the form of the ribs and grooves of the dies. The transverse ribs upon the die by their engagement with the metal prevent any slipping or displacement of the blank between the dies.

1 claim as my invention- 1. The herein-described die for making bolts, provided with transverse ribs and grooves over a portion of its surface to produce longitudinal ribs and grooves or flutings over a portion of the body of the blank, combined with ribs and grooves on another portion of the die and nearly at right angles to the said transverse ribs to form screw-threads on the lower or entering end of the blank.

2. A bolt having its shank provided at its entering end with spiral ribs and grooves arranged to form a screw, and the portion between the screw and the head provided with longitudinal ribs and grooves orflutings, substantially as described.

In testimony whereof I have affixed my sig-. nature in presence of two witnesses.

CHARLES D. ROGERS.

Witnesses:

CHARLES HANNIGAN, Gno. l-I. REMINGTON. 

